It appears that some of the ENC files are basically ZIP files so you can work with them using any ZIP supporting software. You can always try to rename a ENC file as ZIP and see if its extractable.
Convert Uuencode encoded data to WinZIP Compressed ZIP archive.
We have found 3 software records in our database eligible for .enc to .zip file format conversion.
Microsoft Windows software - convert enc to zip on Windows
A compression utility for Windows, ZipZag offers very large support of compression formats. ZipZag opens standard Windows/DOS archives, Linux/Unix/Mac archives, skins, themes, collections as well as games and applications data files.
Convert from enc file
to zip file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned enc to zip. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert enc to zip on OS X
StuffIt for Mac is archive utility that is able to create ZIP and SITX archives as well as extract 25 different formats including StuffIt, Zip, RAR and Tar.
StuffIt Deluxe for Mac is utility used to backup, share, archive, encrypt and shrink photos, music, and other documents. It supports variety of archive and compression file formats.